MEASURING A NATIONS INCOME. Microeconomics Microeconomics is the study of how individual households and firms make decisions and how they interact.

MEASURING A NATIONS

INCOME

MicroeconomicsMicroeconomics is the study of

how individual households and firms make decisions and how they interact with one another in markets.

MacroeconomicsMacroeconomics is the study of

the economy as a whole.Its goal is to explain the economic

changes that affect many households, firms, and markets at once.

The Economy’s Income and Expenditure When judging whether the economy is doing well or poorly, it is natural to look at the total income that everyone in the economy is earning.

For an economy as a whole, income must equal expenditure because:Every transaction has a buyer and a seller.

Every dollar of spending by some buyer is a dollar of income for some seller.

The Measurement of Gross Domestic Product

Gross domestic product (GDP) is a measure of the income and expenditures of an economy.

It is the total market value of all final goods and services produced within a country in a given period of time.

GDP

GDP

The Measurement of GDP

The equality of income and expenditure can be illustrated with the circular-flow diagram.

Figure 1 The Circular-Flow Diagram

Spending

Goods andservicesbought

Revenue

Goodsand servicessold

Labor, land,and capital

Income

= Flow of inputs and outputs

= Flow of dollars

Factors ofproduction

Wages, rent,and profit

FIRMS•Produce and sellgoods and services•Hire and use factorsof production

•Buy and consumegoods and services

•Own and sell factorsof production

HOUSEHOLDS

•Households sell•Firms buy

MARKETSFOR

FACTORS OF PRODUCTION

•Firms sell•Households buy

MARKETSFOR

GOODS AND SERVICES

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“GDP is the Market Value . . .”Output is valued at market prices.

“. . . Of All Final . . .”It records only the value of final goods, not intermediate goods (the value is counted only once).

“. . . Goods and Services . . . “It includes both tangible goods (food, clothing, cars) and intangible services (haircuts, housecleaning, doctor visits).

“. . . Produced . . .” It includes goods and services

currently produced, not transactions involving goods produced in the past. (Don’t count USED goods)

“ . . . Within a Country . . .” It measures the value of production

within the geographic confines of a country.

“. . . In a Given Period of Time.” It measures the value of production

that takes place within a specific interval of time, usually a year or a quarter (three months).

GDP includes all items produced in the economy and sold legally in markets.

What Is Not Counted in GDP?GDP excludes most items that are produced and consumed at home and that never enter the marketplace.

It excludes items produced and sold illicitly, such as illegal drugs.

GDP (Y) is the sum of the following:Consumption (C) Investment (I) Government Purchases (G)

Net Exports (NX)

Y = C + I + G + NX

COMPONENTS OF GDPConsumption (C):The spending by households on

goods and services, with the exception of purchases of new housing.

Investment (I):The spending on capital

equipment, inventories, and structures, including new housing.

COMPONENTS OF GDPGovernment Purchases (G):The spending on goods and services

by local, state, and federal governments.

Does not include transfer payments because they are not made in exchange for currently produced goods or services.

Net Exports (NX):Exports minus imports.

Table 1 GDP and Its Components

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GDP and Its Components (2001)

Consumption 69%

Government Purchases

18% Net Exports -3 %

Investment16%

NOMINAL vs. REAL GDP

Nominal GDP values the production of goods and services at current prices.

Real GDP values the production of goods and services at constant prices.

An accurate view of the economy requires adjusting nominal to real GDP by using the GDP deflator.

Table 2 Real and Nominal GDP

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Table 2 Real and Nominal GDP

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Table 2 Real and Nominal GDP

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The GDP deflator is a measure of the price level calculated as the ratio of nominal GDP to real GDP times 100.

It tells us the rise in nominal GDP that is attributable to a rise in prices rather than a rise in the quantities produced.

The GDP deflator is calculated as follows:

G D P d efla to r =N o m in a l G D P

R eal G D P 1 0 0

Converting Nominal GDP to Real GDPNominal GDP is converted to real GDP as follows:

R eal G D PN o m in a l G D P

G D P d efla to r2 0 X X2 0 X X

2 0 X X

1 0 0

Table 2 Real and Nominal GDP

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Figure 2 Real GDP in the United States

Billions of1996 Dollars

$10,000

9,000

8,000

7,000

6,000

5,000

4,000

3,0001970 1975 1980 1985 1990 20001995

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GDP AND ECONOMIC WELL-BEINGGDP is the best single measure of the economic well-being of a society.

GDP per person tells us the income and expenditure of the average person in the economy.

Higher GDP per person indicates a higher standard of living.

GDP is not a perfect measure of the happiness or quality of life, however.

GDP AND ECONOMIC WELL-BEING

Some things that contribute to well-being are not included in GDP.The value of leisure.The value of a clean environment.The value of almost all activity that

takes place outside of markets, such as the value of the time parents spend with their children and the value of volunteer work.

Table 3 GDP, Life Expectancy, and Literacy

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SUMMARY

Because every transaction has a buyer and a seller, the total expenditure in the economy must equal the total income in the economy.

Gross Domestic Product (GDP) measures an economy’s total expenditure on newly produced goods and services and the total income earned from the production of these goods and services.

SUMMARY

GDP is the market value of all final goods and services produced within a country in a given period of time.

GDP is divided among four components of expenditure: consumption, investment, government purchases, and net exports.

SUMMARY

Nominal GDP uses current prices to value the economy’s production. Real GDP uses constant base-year prices to value the economy’s production of goods and services.

The GDP deflator—calculated from the ratio of nominal to real GDP—measures the level of prices in the economy.

SUMMARY

GDP is a good measure of economic well-being because people prefer higher to lower incomes.

It is not a perfect measure of well-being because some things, such as leisure time and a clean environment, aren’t measured by GDP.